Note 2 - Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Investments, fair value	$ 5,392,022	$ 5,564,662
Publicly Traded Common Stock [Member]
Investments, fair value	225,630	575,720
Publicly Traded Options [Member]
Investments, fair value	6,048	28,598
Private Company Common Stock [Member]
Investments, fair value	4,960,344	4,960,344
Private Company Preferred Stock [Member]
Investments, fair value	200,000	0
Fair Value, Inputs, Level 1 [Member]
Investments, fair value	231,678	604,318
Fair Value, Inputs, Level 1 [Member] \| Publicly Traded Common Stock [Member]
Investments, fair value	225,630	575,720
Fair Value, Inputs, Level 1 [Member] \| Publicly Traded Options [Member]
Investments, fair value	6,048	28,598
Fair Value, Inputs, Level 3 [Member]
Investments, fair value	5,160,344	4,960,344
Fair Value, Inputs, Level 3 [Member] \| Private Company Common Stock [Member]
Investments, fair value	4,960,344	4,960,344
Fair Value, Inputs, Level 3 [Member] \| Private Company Preferred Stock [Member]
Investments, fair value	$ 200,000	$ 0

IRONSTONE PROPERTIES, INC. 10-Q